i m currently on a project that requires me to do symbol to symbol phase
estimation. was using the non data aided viterbi&viterbi...

i m currently on a project that requires me to do symbol to symbol phase
estimation. was using the non data aided viterbi&viterbi algorithm
unfortunately i wasnt able to meet the specs of the project.
was wondering if there is any data aided algorithm via pilots that is able
to achieve enhanced performance?
cheers
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Hi,
I very well understand the advantages of soft input being used for viterbi
decoding but, i fail to understand what is the use of soft...

Hi,
I very well understand the advantages of soft input being used for viterbi
decoding but, i fail to understand what is the use of soft output?
How is this soft output generated and how is it useful.If its iterative
decoding then we can use this output softbits for further decoding.
please let me know how to generate the soft-output and the use of it.
Rgds,
S.Diwakar.
_____...

Hi all,
I want to implement soft decision viterbi decoder in FPGA. I have already
implemented hard-decision decoding and the design works fine...

Hi all,
I want to implement soft decision viterbi decoder in FPGA. I have already
implemented hard-decision decoding and the design works fine in xilinx
FPGA. We have implemented "high bit clear circuit" for path metrics
normalization to reduce the area.
Now, i want to implement soft-decision decoding an I need to change the
BMU and ACS modules in my code.
One thing that worries me is the ...

** BER for a FSK noncoherent is
PE=(M-1)/2 * exp(-Es/2No) => PE= (16-1)/2 * exp(-Es/2No)
BER= PE*(M/2)/(M-1)=> BER= PE*8/15
BER= 4 * exp(-Es/2No)
** BER for a BFSK noncoherent is
BER= 1/2 * exp(-Es/2No)
So, BER for 16FSK is 8 times BER for BFSK.
But, after Viterbi in both cases, will be the different between both
modulations 8 times?

I am reading Viterbi decoding technique, and confused with
the trace back. Assume rate 1/2 K=3 convolutional encoding.
When the trace back depth is 5K. Is the trace back operation
performed in blocks of 5K bits and decode 5K bits at a time,
or trace back operation is performed on a 5K FIFO which stores
the state history, and decode the single bit in the beginning of the
state history FIF...

Hi,
Can anyone plz tell me how to decode QPSK convolutional encoded symbols
using viterbi soft decoding?
I know we have to find the Eucledian...

Hi,
Can anyone plz tell me how to decode QPSK convolutional encoded symbols
using viterbi soft decoding?
I know we have to find the Eucledian distance but plz tell me all the
steps i should follow to decode it.
Regards,
Sarmad

Hi,
Does anyone knows does block length of info data, which then goes through
convolutional encoder(convolutional encoding), has impact of...

Hi,
Does anyone knows does block length of info data, which then goes through
convolutional encoder(convolutional encoding), has impact of performance on
convolutional coding and Viterbi decoding(FEC system).
For example if info message length is 256 bits, or 1024 bits, or 8912 bits
does performance of FEC system(convolutional encoding and Viterbi decoding)
changes with different input block l...

Hello, I was wondering if anyone knows a link to an article and/or paper
which graphically describes the SLVA, preferably through an example. I...

Hello, I was wondering if anyone knows a link to an article and/or paper
which graphically describes the SLVA, preferably through an example. I have
read through the IEEE papers on it, but wanted to see step by step diagrams
of how the N-best paths are selected (not just the analytical analysis).
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Hi guys,
I need to fing plots (or equations) for the theoretical BER for some error
correction codes: Reed-Solomon, Turbo Codes, Viterbi, CRC-8.
Could someone please point me out where can I find this.
Michael B.

Hi,
I have this kind of a problem. I don't know how to implement soft output
viterbi algorithm for non-binary (over ring) codes. What should...

Hi,
I have this kind of a problem. I don't know how to implement soft output
viterbi algorithm for non-binary (over ring) codes. What should the the
extrinsic information contain and how to compute and process it??.
I went through many papers relating sova and non binary case, but still
I?m stuck.
Thank You
Filip

Hi,
Can someone help in proving/disproving the following?
if (a^2 > b^2)
then |a| > |b|.
can it be extended to say that
if (a^2 +...

Hi,
Can someone help in proving/disproving the following?
if (a^2 > b^2)
then |a| > |b|.
can it be extended to say that
if (a^2 + b^2) > (c^2 + d^2)
then ( |a| + |b| ) > ( |c| + |d| )
This is to check if an euclidean distance measure can be replaced by an
absolute distance measure?
Thanks,
Raju

Hello,
Does anyone know how to estimate the BER of a Viterbi decoder when
p = |H|^2 * |r-x|^2 is used as the decision metric ?
Thanks...

Hello,
Does anyone know how to estimate the BER of a Viterbi decoder when
p = |H|^2 * |r-x|^2 is used as the decision metric ?
Thanks for your cooperation.
Engin
|H|^2 = Channel's kth coefficient in frequency domain
r = received symbol
x = transmitted symbol
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Greetings,
I always assumed that MAP and ML performances differ, with former
being superior. However, under certain conditions ML approaches...

Greetings,
I always assumed that MAP and ML performances differ, with former
being superior. However, under certain conditions ML approaches MAP
performance. I know of trivial case when the variables to be decoded
are uncorrelated, ML is MAP. I am interested in knowing about other
cases when this is true.
Could anyone throw some light on this issue?
Regards,
KK

I'm evaluating receiver structures for the ETSI DMR spec, but not having
much luck finding any work in this area. They use continuous...

I'm evaluating receiver structures for the ETSI DMR spec, but not having
much luck finding any work in this area. They use continuous phase
modulation, so I anticipate I'll have to use a viterbi demodulator to get
it done. Unfortunately they choose h=.27, so I have at least 200 states,
times whatever number of symbol cycles their pulse shape is over (not
clear on this, three maybe?). So I'm loo...

Hello,
I am trying to demodulate a binary CPFSK with modulation index of 0.6
With correlation receiver & viterbi decoder I am able to...

Hello,
I am trying to demodulate a binary CPFSK with modulation index of 0.6
With correlation receiver & viterbi decoder I am able to demodulate a synchronized signal, but i
am stuck with synchronization techniques.
Can anyone please let me know any ideas for synchronization.
Thanks & Regards,
Ajith

Hi,
I am working on equalization schemes without using Viterbi type
of algorithms. Assume that complexity is not an issue. I am trying...

Hi,
I am working on equalization schemes without using Viterbi type
of algorithms. Assume that complexity is not an issue. I am trying to
detect the received samples using ML equation. Mathematically , if a1,
a2, a3 .. aN are the input symbols, say h1, h2, h3 are the channel tap
gains. Then the received signal is represented in vector fom as
R= A*h+n, where R is the received vector...

I am using "vitdec" in Matlab with 'trunc' and 'unquant' propoerties
for decoding real-valued data in between almost -2.5 and 2.5 (i.e.
binary...

I am using "vitdec" in Matlab with 'trunc' and 'unquant' propoerties
for decoding real-valued data in between almost -2.5 and 2.5 (i.e.
binary values with interference and noise). The interesting problem is
that I'm having intervals of %100 correct detections and %100 wrong
decisions (bits are flipped) in my decoded stream. It's like the
detector changes sign and switches between two interval...